Carb StoneThe carb stone is another dual purpose device! It can be used to oxygenate your wort when hooked up to an oxygen source with both the FLEX and FLEX+. It can also be used to add pressure for transfers, purging oxygen, carbonating, etc when used with the FLEX+ which is rated for 15psi. If reducing your carbonating time from upwards of a week down to less than 24hrs is appealing then the FLEX+ and a carb stone bundle might be your best friend! It also
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